| 摘要 |
In a method for determining the state of charge of rechargeable batteries by integration of the amounts of current flowing during charging and discharging, a first state of charge value LZA is determined by continuous integration of the rechargeable battery current. A second state of charge value LZB is determined by measurement of the no-load voltage U0 after receiving or supplying a defined amount of charge Q which is sufficient in order to leave the region of the mixed potential of the electrodes and to reach a no-load voltage of the rechargeable battery, and by comparison of this measured no-load voltage U0 with empirically determined no-load voltage characteristics for the rechargeable battery. From the state of charge values obtained in this way, that state of charge value is chosen which is more reliable in the preceding operating conditions, with the assessment of LZA taking into account in particular the charge throughput in the assessment of LZB, in particular the amount of charge Q which has flowed. The amount of charge Q should be at least 1 to 40%, preferably 5 to 50%, of the rated capacity of the rechargeable battery.
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